Glasses frame carrier for a reproducing machine

Abstract

A glasses frame carrier for a reproducing machine, of the type comprising a base plate (1), two parallel strips (8, 9) slidably mounted on the base plate are relatively movable toward and away from each other, and a device for centering the glasses frame between the two strips. The strips are respectively fixed to opposed parallel portions of a cable (16) forming a loop around two spaced-apart pulleys, one pulley (14) constituting a cable-driving element (16) and including a braking device (21, 23, 24) which is adjustable and constituted by an elastic element (23) which biases the pulley (14) in contact with a friction element (21).

We claim: 
     
       1. Glasses frame carrier for a reproducing machine, which carrier comprises a base plate including four supports located at corners of a rectangle, two parallel strips each slidably mounted on two of said supports, said strips being relatively movable selectively toward and away from each other, and means for centering and supporting a glasses frame between said two parallel strips, said strips being respectively fixed to means comprising a cable having opposed parallel portions and to which portions said strips are each fixed, two spaced-apart pulleys each rotatably connected to said supports, said cable forming a loop around said pulleys, one of said pulleys constituting cable-driving means and one of said pulleys including braking means. 
     
     
       2. Glasses frame carrier according to claim 1, wherein the pulley constituting said cable-driving means is the pulley including said braking means. 
     
     
       3. Glasses frame carrier according to claim 2, wherein said braking means includes a friction element and an elastic element and is adjustable, said elastic element biasing the respective pulley axially in contact with said friction element. 
     
     
       4. Glasses frame carrier according to claim 1, comprising parallel superimposed bars fixed on said supports carrying said bars, said strips being slidably mounted on said bars, and said pulleys being mounted on two opposed supports of said base plate. 
     
     
       5. Glasses frame carrier according to claim 4, wherein said cable is fixed to a pin respectively connected to said strips and is fixed on said one of said pulleys constituting said cable-driving means. 
     
     
       6. Glasses frame carrier according to claim 3, comprising superimposed bars, fixed to said base plate carrying said bars, a shaft fixed to one of said supports and having a screw-threaded end portion, and a nut screw-threadedly engaged on said screw-threaded end portion of said shaft, said strips being slidably mounted on said bars, said pulleys being mounted on two opposed supports of said supports, said one of said pulleys constituting cable-driving means being a cylinder constituting a control knob rotatively mounted on said shaft, said friction element being a Nylon washer interposed between said cylinder and said one of said supports, and said elastic element comprising at least one Belleville washer disposed on said shaft between an opposed end of said cylinder and said nut. 
     
     
       7. Glasses frame carrier according to claim 1, comprising a motor-speed reducer unit drivingly connected to said one of said pulleys constituting cable-driving means. 
     
     
       8. Glasses frame carrier for a reproducing machine, which carrier comprises: a base plate including four vertical supports located at corners of a rectangle;   two parallel strips each slidably mounted on two superimposed parallel bars interconnecting two of said supports on said base plate, said strips being relatively movable on said bars selectively toward and away from each other; and   means for centering and supporting a glasses frame between said two movable parallel strips, said parallel strips being respectively fixed to means comprising a cable having opposed parallel portions and to which portions said strips are each fixed, two spaced-apart pulleys each rotatably connected to a support and to said base plate, said cable forming a loop around said pulleys and being fixed to one of said pulleys constituting cable-driving means and one of said pulleys fixed to each of said parallel slidable strips, one of said pulleys including braking means.